RamzesRUS September 2, 2014 at 18:56

Cubietruck. Travel mini server. Part 3

Configuring the HUAWEI E3372 Modem

Install the usb-switchmodem package

sudo apt-get install usb-modeswitch

We connect the modem and look with the command which network card will appear after the connection:

ifconfig -a

Appeared interface eth1

eth1      Link encap:Ethernet  HWaddr 0c:5b:8f:27:9a:64
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

Or you can see the same in the dmesg message log:

dmesg

A view entry should appear.

cdc_ether 3-1:1.0: eth1: register 'cdc_ether' at usb-sw-ehci-1, CDC Ethernet Device, 0c:5b:8f:27:9a:64

Configure eth1 interface in / etc / network / interfaces

sudo nano /etc/network/interfaces

Add lines

#
allow-hotplug eth1
iface eth1 inet dhcp

Now we take out the modem and after 5 seconds we put into place. Check if the eth1 interface received an address from the modem

eth1      Link encap:Ethernet  HWaddr 0c:5b:8f:27:9a:64
          inet addr:192.168.8.100  Bcast:192.168.8.255  Mask:255.255.255.0
          inet6 addr: fe80::e5b:8fff:fe27:9a64/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:17 errors:0 dropped:0 overruns:0 frame:0
          TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4366 (4.2 KiB)  TX bytes:1364 (1.3 KiB)

We made sure that the eth1 interface received the address 192.168.8.100. We
check which gateway is installed by default.

ip route

default via 192.168.1.10 dev eth0
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.247
192.168.8.0/24 dev eth1  proto kernel  scope link  src 192.168.8.100

As a gateway, we see the 192.168.1.10 eth0 interface. This means that we will go online through the eth0 network, and we need through the eth1 modem. To do this, delete the default gateway

sudo route del default

And add the modem 192.168.8.1 as a gateway

sudo route add default gw 192.168.8.1

Check

default via 192.168.8.1 dev eth1
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.247
192.168.8.0/24 dev eth1  proto kernel  scope link  src 192.168.8.100

Now we go online via the HUAWEI E3372 modem.

So far, only such a method has been used.
Now I’m figuring out how to do it:
1. If both the network and the modem are connected at the same time, the gateway would be eth0
2. If the connection was disconnected or there was no connection on the eth0 interface when it was turned on, the gateway would automatically switch to eth1

If anyone has experience in this matter, I ask to help.

Cubietruck. Travel mini server. Part 1
Cubietruck. Travel mini server. Part 2

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Cubietruck. Travel mini server. Part 3

Configuring the HUAWEI E3372 Modem

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